<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal">What are some suggestions for selecting what should be monitored with third party software such as Solar Winds to ensure optimal performance of the varnish servers. My Network operations team just asked me what specifically do I need to
have monitored within Varish <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<table class="MsoNormalTable" border="0" cellpadding="0">
<tbody>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">Name<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">Description<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">sess_conn<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of accepted client connections by Varnish Cache<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">client_req<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of received client requests. Increments after a request is received, but before Varnish responds<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">sess_dropped<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of connections dropped due to a full queue<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">cache_hit<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of times a file was served from Varnish’s cache<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">cache_miss<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of times a file was requested but was not in the cache, and was therefore requested from the backend<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">cache_hitpass<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of hits for a “pass” file<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">n_expired<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of expired objects for example due to TTL<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">n_lru_nuked<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Least Recently Used Nuked Objects: Cumulative number of cached objects that Varnish has evicted from the cache because of a lack of space<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">threads<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of threads in all pools<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">threads_created<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of times a thread has been created<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">threads_failed<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of times that Varnish unsuccessfully tried to create a thread<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">threads_limited<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of times a thread needed to be created but couldn't because varnishd maxed out its configured capacity for new threads<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">thread_queue_len<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Current queue length: number of requests waiting on worker thread to become available<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">sess_queued<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of times Varnish has been out of threads and had to queue up a request<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_conn<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of successful TCP connections to the backend<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_recycle<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of current backend connections which were put back to a pool of keep-alive connections and have not yet been used<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_reuse<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of connections that were reused from the keep-alive pool<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_toolate<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of backend connections that have been closed because they were idle for too long<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_fail<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of failed connections to the backend<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_unhealthy<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of backend connections which were not attempted because the backend has been marked as unhealthy<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_busy<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Cumulative number of times the maximum amount of connections to the backend has been reached<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><b><span style="color:#1F497D">backend_req<o:p></o:p></span></b></p>
</td>
<td valign="top" style="padding:.75pt .75pt .75pt .75pt">
<p class="MsoNormal"><span style="color:#1F497D">Number of requests to the backend<o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<font face="Arial" color="Gray" size="2"><br>
This email (including any attachments) may contain confidential information intended solely for acknowledged recipients. If you think you have received this information in error, please reply to the sender and delete all copies from your system. Please note
that unauthorized use, disclosure, or further distribution of this information is prohibited by the sender. Note also that we may monitor email directed to or originating from our network. Thank you for your consideration and assistance. |<br>
</font>
</body>
</html>